Rebecca Brennan

About Rebecca

With over 25 years of experience at the sharp end of agency leadership, Rebecca understands that high performance isn’t an accident, it’s a design. From her early days at some of London’s top advertising agencies to founding and selling her own business, she has navigated the complexities of scaling, merging, and leading teams through rapid change. 

In 2015, Rebecca transitioned from marketing specialist to high-performance coach, driven by a passion for the “human element” of business. She doesn’t just look at the bottom line; she focuses on the individual and collective behaviors that drive it. 

Expertise

• MSc Coaching and Behavioural Change
• MSc Psychology
• NLP Master Practitioner
• Accredited Tiny Habits® Behaviour Design
• Accredited Insights Discovery® Practitioner
• Specialist: Team Coaching and Board Dynamics

PlanetK2 Role

As an associate coach in the PlanetK2 delivery team, Rebecca works shoulder-to-shoulder with clients 1:1, with teams, or across whole organisations to unlock performance potential. 

• Real-World Leadership: She has lived the challenges of a founder and C-suite executive.
• Psychological Rigor: Her approach is grounded in behavioural science, not just theory.
• Scalable Impact: She knows how to maintain peak performance through structural shifts and rapid growth.

Other Stuff

Outside of her professional work, Rebecca is a dedicated mountain athlete. Whether running long trails in the UK, Europe, and Nepal or climbing as an Alpinist, she thrives in the challenges the outdoors provides. A dedicated lifelong competitor, from 5kms to ultra distance records 

• Rebecca is a regular Park Runner
• Completed over 100 marathons from her first one in 2001 to 2026
• Set the Fastest Known Time (FKT) for a female on the 230-mile Cape Wrath Trail in the wilderness of Scotland’s West Coast
• Now setting her focus on strength as well as speed as an active Hyrox competitor.